Signals and indicators – Alarms – Fluid flow
Patent
1976-05-04
1978-07-04
Swisher, S. Clement
Signals and indicators
Alarms
Fluid flow
116115, G01P 1300
Patent
active
040982211
ABSTRACT:
A drum rotation indicator enables a crane operator to sense rotation of a drum, and thereby determine linear movement of a cable, that has one end wound about the drum. This indicator has a cam, that rotates with the drum, and a cam follower, that translates rotation of the cam into linear movement. A readout plunger is located conveniently for the operator's hand, and linear motion that is induced by the cam follower is transferred to the readout plunger by a medium that can be a mechanical linkage, a push-pull cable, or a hydraulic system. In a preferred embodiment of the invention, the cam follower disengages automatically from the cam after linear motion has been transferred to the readout plunger. The linear motion transferring medium also transfers motion from the readout plunger to the cam follower, which pivots into engagement with the cam. The cam has a serrated periphery, to give an instantaneous response, upon rotation of the drum, to engagement of the cam follower with the cam.
REFERENCES:
patent: 105071 (1870-07-01), Harris
patent: 1467373 (1923-09-01), Gowin
patent: 2717993 (1955-09-01), Newsom
patent: 2745633 (1956-05-01), Cornwell
patent: 2802441 (1957-08-01), Epstein
Doyle John Eric
Mickelson Roger D.
Willard David L.
Corr Denis E.
Edwards J. W.
FMC Corporation
Swisher S. Clement
Tripp C. E.
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